The Texas power grid is isolated and cannot routinely import power. It can in very temporary and emergency situations, but they do not as a matter of course to avoid federal oversight.
So while the US Western grid can time shift one hour in the way you describe, Texas is isolated.
So while the US Western grid can time shift one hour in the way you describe, Texas is isolated.
https://en.wikipedia.org/wiki/Texas_Interconnection
https://www.texastribune.org/2011/02/08/texplainer-why-does-...